BNC 1420 - Video Microscope - Manual (Page 14)

12
Pin connections
1 5 V DC (max 3 A)
2 Chassis Ground (0 V)
3 Chassis Ground
4 Chassis Ground
5 Chassis Ground
6 LED A drive (TTL)
7 LED B drive (TTL)
8 LED C drive (TTL)
9 LED D drive (TTL)
The light intensity of the LED s of the Model 1420 is controlled by pulse
width modulation with a frequency synchronized to the video signal. Full
light intensity means an illumination duty cycle close to 100%.
LED drive outputs A D are negative logic, ie. TTL level is high when
LEDs are off.
2.2.4 RS232 serial connector
The female 9-pin D-sub connector is for RS232 communications. This
link allows the Model 1420 to receive programming and commands from
an external controller, e.g., a computer running the scopePRO application
or LabView through the provided serial cable. A USB/RS232 converter
can be used for computers without an RS232 connector (COM port).
2.3 Microscope stage
The Model 1420 is fitted with a replaceable microscope stage, attached to
the main body of the instrument by four magnetic locks. To remove the
stage, simply pull the stage gently up until it releases. The stage top is a
polished stainless steel plate, which can be machined to provide
application-specific mounts for the fluidic device, electrodes, fluid hoses
or other fittings.